Flue liner is suitable for use with burning gas, oil, coal, coke, cured dry logs, cured dry peat. Make sure the arrows are pointing upwards (gas flow). Now attach the Nose Cone onto the end of the Flue Liner, again making sure the arrows on the Flue Liner are pointing away from the Nose Cone in a upward direction so when the liner is installed the arrows will be pointing to the top of the chimney.